Variometer



P. J. SNIDER Sept. 17, 1935.

VARIOMETER Filed Sept. 23, 1932 JYWQ IVM Fau/ J 517127591" Patented Sept. 17, 1935 UNITED STATES PATENT OFFICE VARIOMETER Delaware Application September as, 1932, Serial No. b34512 2 Claims.

This invention relates to a coupling-unit in connection with radio receiver mechanism.

An object of this invention is to provide a coupling unit of compact form and whichwill per- 5 unit of ready adjustment to meet. the conditions of its adaptation. This has been accomplished by providing a pair of adjustable supports each oi which independently carries a coil element of the coupling unit so that the relative positions to oi the coils may be varied.

A further object of the invention is to provide the shielded coupling unit including a transtormer so that coupling of the contributing coils thereof may be altered yet maintain perfect 15 shielding of the complete unit. This has been accomplished by constructing the shield means so as to have overlapping portions oi considerable extent so that when the contributing coils of the transformer are mounted one upon each portion of the shielding means, that the same may be adjusted throughout their range without disruption of the mechanical connection oi said shielding means.

Another object of the invention is to provide 5 a variable coupler of simplified construction and of eihcient operation. This has been accoin plished by providing independent supports for a fined coll anda movable coil and a cup like shield member for each, the shield members be- 30- ing telescopically engageable throughout a definite range of positions whereby the proximity of the coils may be controlled.

Further objects and advantages of the present invention will be apparent from the following de 35 scription, reference being had to the accompanying drawing wherein a preferred embodiment of one form of the present invention is clearly shown.

in the drawing: to Fig. 1 illustrates in section a physical embodiment of the improved coupling unit hereinafter to be described.

Fig. 2 is a similar illustration of another form of coupling unit involving the instant invention. 45 Fig. 3 is a circuit diagram illustrative of the adaptation of the invention as disclosed in Fig. l to a radio circuit.

Fig. s is a circuit diagram illustrating an adaptation of the coupling unit illustrated in so 12.

Referring particularly to the drawing 29) refers to my improved coupling unit and comprises a' pair of telescoping members, which for the convenience of description, will be identified as a to cup 22 and a cap 23, each of which has secured thereto a. dielectric form or coil support 26 and 28 respectively. It is preferred that the members 22 and 24 be cylindrical in cross section though if desired'they may be of othercontour,

but for the purpose or effecting the instant in- 5 vention should have the head members 29 and so. The coil supporting member 26 may be wood, iibr or other equivalent material in cylindrical term and is provided with a longitudinal bore or recess 32 terminating in a smaller here 34 which rnalzes for the reception and passage of a bolt 36 as illustrated in the drawing.

The head member 28 of the cup 23 is provided with an aperture it at the center thereof through which passes the bolt 36 and when a nut 40 is applied thereto operates to secure the coil form (I to the head 29 or" the cup at the central axis thereof. The bolt 35 is of sumcient length to be passed through an aperture oi a chassis or frame member 42 and receive an additional nut 15 M by which the coupling unit may be mounted wherever desired. The coil form it is constructed of similar material to that of the form to and is secured to the head member 30 of the cap 24 by means or" a screw 46 driven through the head member 30 into the body of the coil form as appears dotted lines in Fig. 1.

The construction of thecoupling unit thus far described is identical for both of the forms that are illustrated in Figs. 1 and 2, and hence like reference characters have been applied to similar parts appearing in both figures. Referring again to the construction in Fig. l coil windings are mounted on each of the coil forms 26 and 28 which may be accomplished in any desired means as. by winding the coils and cementing them thereonin their proper place, or if so desired the coil forms 28 and 38 may be used as mandrels uponwhich the desired coils are wound to satisfy the predetermined constants.

Referring again to Fig. 1 a coil 50 is secured to the form 28 carried by the cap 24 and has its lead 32 trailed out/to pass through an aperture 5d of the cup it and through an aperture 56 of the chassis member 42 where the lead 52 may be connected into the desired circuit. A second lead 53 is provided for interconnecting with a second coil til mounted upon the coil term it and which I has provision for connecting with the exterior circuit by means of a lead 52. Inasmuch as these same coils til and fill with their associated connections are also to be found in the embodiment illustrated in Fig. 2 the same reference characters have been applied thereto. With respect to these two forms or the invention,'there exists the difference that the coil 60 instead of being mounted near the end of the coil form 26 as illustrated in Fig. 1 is secured at about the mid-point thereof, or at least sufllciently removed from the free end of the form 26 to permit the mounting of a third coil 10 as illustrated in Fig. 2. In this instance the coil 10 provides leads 12 and 14 that are passed through aligned apertures 16 and 18 in the head member 29 and the chassis member 42 respectively, from whence the leads I! and Il may be connected into the external circuit.

In Figure 3 two cascaded tubes T1, T2 are shown. Tube T1 is provided with an anode P1 which is connected through the variable devices 20, 50, 6D to the conductor 62. The anode P1 is also connected to grid Go of the tube T2 through a condenser C. A resistance R is connected between the grid G2 and ground. It will be seen that the coupling in Figure 3 corresponds to the arrangement shown in Figure 1 wherein the winch ings 50 and 60 are adjustably disposed with respect to one another.

In Figure 4 the two tubes Tl and T2 are cascaded through the means comprising the windings Ill and windings 50 and 6D. This arrangement corresponds to the arrangement shown in Figure 2 wherein the coils 5B and 60 are again adjustably disposed with respect to one another.

While the form of embodiment of the present invention as herein disclosed, constitutes a preferred form, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow.

What is claimed is as follows:

1. In a system wherein a pair of cascaded electronic tubes is arranged so that the output of one of the tubes is coupled to the input of the other by means of a primary coil and a secondary coil one of said coils being wound in two sections, in

combination a metallic shield made up of a pair of telescopically engaging members, a core member mounted within one of said shielding members, said core member having mounted thereon one of said coil sections and the other coil, a second core member mounted within the other of said shielding members said second core member having mounted thereon the other coil section, said telescopically engaging members providing means for varying the proximity of the coils mounted on the one support with respect to the coil mounted on the other support.

2. In a system wherein a pair of cascaded electronic tubes is arranged so that the output of one of the tubes is coupled to the input of the other, a primary coil associated with the ouput of the first tube and a secondary coil associated with the input of the second tube said secondary coil being wound in two sections the two sections being connected to each other by means of a flexible conductor, a metallic shield made up of a pair of telescopically engaging members, a core member mounted within one of said shielding members said core member having mounted thereon the primary coil and one of the sections of said secondary coil a second core member mounted within the other of said shielding members said second core member having mounted thereon the other section of the secondary coil, said telescopically engaging members providing means for varying the proximity of the primary coil and the section of the secondary mounted on the same support therewith with respect to the section of the secondary coil mounted on the other support whereby a variation in coupling between the output of the first tube and the input of the second tube may be obtained while insuring complete shielding for the coupling system.

PAUL J. SNIDER. 

